Amari, Elemental Beastcaller

Red Elementals you control get +2/+0
Blue Elementals you control get +0/+2
{1}{r}: Create a 1/1 Red Elemental creature token.
{1}{u}: Create a 1/1 Blue Elemental creature token.
{2}{u}{r}: Create a 1/1 Red and Blue Elemental creature token.